ComancheKid45

Closest thing ive ever found that was acctually an MJ was bodies for RC trucks. theres plenty of J Truck replicas out there and I'm sure there's XJs as well, but in all my efforts of searching ive never even seen a picture of a scale model Comanche :(

A midnight Blue Eliminator sounds outrageously sexy :drool: :brows:

After an oil change, new o2 sensor and 6 new Champion plugs Shes back to her old self :thumbsup:

There WAS gas in the oil :eek: I'm glad i checked that! So after an oil change, 6 new Champion copper plugs and a new o2 Sensor....I Fired her up again and it came to life and idled like it was new again :cheers: So after this whole feasco this week I'm out close to $400 in parts, including the towing bill but in the end thats still less than a New car payment and I learned alot more about my MJ, I Hope that this fixes the issues for awhile and I'm finally ready to enjoy my Comanche some more this winter :yes:

The Distributor was installed with the rotor pointed right 2 the 5 o clock posistion with cyl #1 at TDC on the Compression stroke. I'm pretty sure the timing is right and this small issue has 2 deal with the o2 sensor or possibly even fouled plugs. Ill have my new ECM tomorrow and will replace those 2 items and see where that takes me :wrench:

It seems to run worse once it warmed up (o2 sensor) Ill be replacing that tomorrow and i think ill do a fresh set of plugs as well. Ill check the oil as well, its still very clean (less than 1k on it). Thanks guys!

Alrighty I got my 88 running again after a ECM swap but now it seems to have picked up an idle issue. It starts up great but runs like its missing. However if i unplug the vaccum line from the rear grommet on the valve cover to where it runs into the intake manifold it comes to life and seems to run great, once I plug that line back it the engine stalls out. I have swapped that line with another and even cleaned it out, there is no obstruction... Also is it possible that with so many attempts of starting and fuel being dumped into the engine that once i fired it up that all that could have killed my O2 sensor possibly hindering my running issue as well? Thanks for any info guys, youve been a great help :thumbsup:

ALRIGHT! I finally made some progress this evening. I swapped out the ECM from my 89 and got the truck to Fire up....yay. However it wasnt running 2 well at all and I'm almost certian thats due to the broken knock sensor. I have 2 reset the timing again and make sure itll clear up after i swap out the knock sensor but as of tonight I'm calling this whole problem due to a Failed ECM!

Its been almost over 2 weeks and I still havent seen mine :( Did you get my payment? Thanks!

We have just been using a spark plug in the wire directly off the coil to check for spark, with no luck. My next option is 2 begin tracing wires via the FSM Diagram and possibly be swapping out ECM, although that doesnt seem like a quick job with its location...

There he is! :D :wrench:

Yes, I swapped the entire Distributor assembly including the pickup from 1 truck to another with no success...

spend another evening in the garage troubleshooting my "No Start" condition on my 88 :dunno: :(

I always liked the little fella with the wrench.....idk where he has vanished off to though?

From what i understand Yes, that would be correct.

Alright, I got it into the Garage tonight with my 89 and swapped the following parts back and forth to no avail. Ign Coil and Control Unit Distributor Crank Posistion Sensor Main plug wire All 3 Relays I have power coming into the coil but am getting no spark from the coil. I put my Crank sensor from my 88 into the 89 and the 89 runs as good as always so ive definently ruled that out. My last option is the ECM under the dash, otherwise i have no idea what else sends a signal to the coil for spark???.....Any help or suggestions is appreciated guys, Thanks A bunch!

Its it part of the Ing. pickup? or a standalone sensor? possibly something else i can look into. thanks!

Yep thats an FEY bumper from the looks of it. ;)

Where is the ICM (ICU) located on our trucks? I plan on diagnosing the Cap/Rotor and distributor area this evening......It is a Renix engine and Theres not a whole lot that goes into making it run, lol Its just a puzzle for me for the time being. :doh:

Yep it cranks over fine, and theres no spark from the coil....

The CPS was not it, i pulled 1 from my 89 and swapped it in, nothing.... Reinstalled back into the 89 and the 89 fired up and ran normal as before. Gonna swap the MAP sensor and the Knock sensor tomorrow....those are about the only 2 i havent tried that would possibly make any difference. Ill work on it again tomorrow..

Just swapped the CPS to no avail... Have swapped Coils, Ballast Resistor and Relays so far. I'm working out in the cold....I'm gonna try the MAP sensor as well. It cranks and reeks of fuel, but i see no leaks or signs of a leak anywhere....

Well the plastic sleeve was all but falling apart in my hands last night. The sensor itself is in pretty crummy shape, but would that cause the truck to just shut off (it was ideling fine, no misses or nothing) and not refire?.... I'm gonna try swapping out the coil, CPS and the knock sensor and see where that gets me.... So ill dig into it alittle later on today. Thanks Again.

Alright, well my MJ left me stranded for the 1st time last night, 30 miles from home. Ive pretty much narrowed it down to the CPS (again) or the Coil. However i found this plug and sensor right above the oil pan on the drivers side wasnt in happy shape at all but I have no idea what it is or if it would have anything to do with my no start issue. I circled it for you guys, the plug on the bottom left is for the O2 sensor... Thanks for any help. 88/4.0/AW4/4x4

:doh: Let em run another classic vehicles reputation in the Yuppie America dirt... :roll: